Allen-Bradley 1747-ASB User Manual

Publication 1747-UM006B-EN-P - June 2003
Addressing 3-9
1-Slot Addressing Examples
The following example illustrates how to map modules requiring:
• one word of input or output image
• more than one word of input or output image
If images overlap, a 1747-ASB module error occurs. For example, if
32-point input modules are installed in slots 1 and 2, their input
images overlap and a 1747-ASB module error occurs.
II II I
O OOO
012 3 4 56789 1011121314151617181746 Slot Numbering
Slot Pair
1234 5 6789
O
II I I
OO OO O
I = Input Module
= Output Module
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
Slot Pair
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
1
2
3
4
5
6
7
8
9
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
1
2
3
4
5
6
7
8
9
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
Slot 18
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
= unused
1747-ASB Input Image 1747-ASB Output Image
07815 07815
1747-ASB Input Image 1747-ASB Output Image
07815 07815
701017
Decimal
Octal701017
Decimal
Octal 701017
Decimal
Octal 7 01017
Decimal
Octal
Slot Pair Slot Pair Slot Pair
Modules Requiring One Word
In the example below, the modules require one word of input or output image.
Input modules do not have to be paired with output modules, because in this
example, only one word of input and output image is required.
To reduce unused image space, slot pairing can be used with 32-point I/O
modules or the system can be configured for complementary I/O. For more
information, refer to the complementary I/O description found on page 4-5.
Modules Requiring More Than One Word
In the example below, the modules require more than one word of
input or output image.
Input modules must be paired with output modules so their input and
output images do not overlap.
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Allen-Bradley 1747-ASB Specifications

General

Brand	Allen-Bradley
Model	1747-ASB
Category	Control Unit
Language	English